2017 GMC Sierra 2500HD All Terrain X

The All Terrain X series are a limited edition of trucks from GMC that are particularly focused on off-road exploits. The HD All Terrain is powered by a 6 liter gas V8, or a particularly powerful 6.6 liter V8 turbo-diesel that puts out 445 hp and no less than 910 lb-ft of torque.

The HD All Terrain X has a high level of special trim, including a body-color grille surround with All Terrain insert, body color door handles and side moldings, 4" black sport side steps, a bed-mounted black sport bar, a spry-on bedliner, and an underbody shield.

The black trailering mirrors are both heated and power adjustable, and feature integrated turn signals, LED amber clearance lamps and LED rear guidance lamps.

Third model in brand’s X series offered with all-new Duramax 6.6L diesel

AUSTIN, Texas — GMC today introduced the 2017 Sierra HD All Terrain X, the most off-road-capable model in the Sierra HD lineup, and one that matches its enhanced capability with trail-ready style and the brand’s signature refinement.

It joins Canyon and Sierra 1500 this fall as the third model in GMC’s distinctive, limited-edition All Terrain X series, offered on the Sierra 2500HD crew cab 4WD with a 6.0L gas V-8 engine or the all-new, next-generation Duramax 6.6L V-8 turbo-diesel. More powerful than ever, the new Duramax delivers a segment-topping SAE-certified 445 hp (332 kW) and an SAE-certified 910 lb.-ft. of torque (1,234 Nm).

“The new Sierra HD All Terrain X’s powerful attitude reflects a popular trend in very capable off-road trucks, executed with a range-topping level of refinement — a combination of attributes GMC has cultivated for years,” said Duncan Aldred, vice president of GMC Sales and Marketing. “And with the new, available Duramax 6.6L, this truck more than matches its bold good looks with true professional-grade capability.”